Flow Analysis on the Effect of Rotational Speed on the Characteristics of 3-Dimentional Screw Propeller of Ship

Abstract

In this study, the commercial code was used in order to derive the discharge flow rate and the thrust force in accordance with the rotational speed of the 3-dimensional blade of screw propeller. In addition, computational domain was considered in this research and it was realized by the analysis in the blades and the outlet chamber. Furthermore, a total of 2,640,222 mesh was calculated in consideration of unstructured mesh and the analysis was performed according to the total of the rotating speed (3200, 2400, 1600, 800rpm). The analysis was carried out on the pressure distribution, discharge flow rate and consequent thrust force according to the rotational speed. Especially, the analysis was realized focusing on the condition of 3200rpm. The difference between the maximum pressure and the minimum was 5.5MPa in the given condition and the discharge flow rate as to the pressure difference was the level of 1956.67 kg/s, as the thrust force of 47083.7 F(N) was obtained. In addition, it was considered that occurrence of cavitation in the given condition is closely related the decrease of durability of screw propeller in the aspects that the thrust force on driving depends on the speed.